f=open("a.txt","r",encoding="utf_8")
content=f.readlines()
i=1
for temp in content:
    print("%d:%s"%(i,temp))
    i+=1
f.close()
f= open("b.txt", "w",encoding="utf_8")

f.write("hello world,i am here! 吕仁玲")

f.close()